Title: NIR/VIS dual-comb spectroscopy comparing high and low repetition rate regimes Show Chinese title

Title: 近红外/可见光双梳光谱学比较高和低重复率模式

Abstract: Dual-comb spectroscopy enables broadband analysis of key molecules with unparalleled frequency resolution and exceptional signal-to-noise ratios across various spectral regions. However, fully harnessing its potential for broadband spectroscopy with high sensitivity and spectral resolution depends critically on selecting the appropriate frequency combs with optimized (comb) parameters tailored to specific applications. This study compares dual-comb spectroscopy systems operating at 80 MHz and 1 GHz repetition rates, in the near infrared and visible spectral regions. The 80 MHz system provides high spectral resolution, ideal for resolving complex spectra, showcased with measurements of NH$_3$ vibrational bands and I$_2$ hyperfine transitions. Utilizing phase-locked feed-forward stabilization, the system delivers excellent signal-to-noise ratios but faces limitations in temporal resolution. The free-running 1 GHz system offers superior temporal resolution and compactness, making it suitable for real-time environmental monitoring in laboratory and field settings. A self-correction algorithm advances the high mutual coherence, enabling high-signal-to-noise measurements without additional electronics. With its 1 GHz resolution, it excels in monitoring NH$_3$ transitions or NO$_2$ lines at high speeds. This work highlights the complementary strengths of these systems for high-resolution spectroscopy and real time trace gas sensing. Show Chinese abstract

Abstract: 双梳光谱技术能够在各种光谱区域实现关键分子的宽带分析，具有无与伦比的频率分辨率和出色的信噪比。 然而，要充分利用其在高灵敏度和光谱分辨率方面的潜力，关键在于选择针对特定应用优化的（梳）参数的合适频率梳。 本研究比较了在近红外和可见光谱区域运行的80 MHz和1 GHz重复率的双梳光谱系统。 80 MHz系统提供高光谱分辨率，非常适合解析复杂光谱，通过NH$_3$振动带和I$_2$亚结构跃迁的测量进行了展示。 利用相位锁定前馈稳定技术，该系统提供了优异的信噪比，但在时间分辨率方面存在限制。 自由运行的1 GHz系统具有优越的时间分辨率和紧凑性，适用于实验室和现场环境中的实时环境监测。 一种自校正算法提高了高互相干性，使得无需额外电子设备即可进行高信噪比测量。 凭借其1 GHz的分辨率，它在高速监测NH$_3$跃迁或NO$_2$线方面表现出色。 这项工作突出了这些系统在高分辨率光谱和实时痕量气体检测中的互补优势。